Drilling machine



Nov. 6, 1945. A. B. MacNElLL DRILLING MACHINE Filed nec. so, 1944 2 'Sheets-Sheet l .hv .fill 'I lllllfll wllvlllfl um Q ab n Inu l n i.lllab r/,f n l u b .liulnlwf viglgl .Jli E ml- 0m, C* @v m l mw n. 0 om. hv Q n, I I l l O* k\ .illl ||ll Il l l bmw I 9 I: Il mb Il n ohm, .Q um ww I om, l. vb m m IIIA." Uil. I.. .a n... DM: om. am Qmm rl bm 3v mb bw mm. H n |i {l} 9v 1l -,HH Hl ilf. 9v. HHM 'Hh .i 9. n.0 mm. Ill.. ummm Ii mY um Q afdewzvadve M mw; 4,45%. ly cnafnfeya Nav. 6, 1945. A. B. MacNElLL 2,388,362

i DRILLING MACHINE Filed'nec. so, 1944 l 2 sheets-sheet 2 Patented Nov. 1945 Arden B. MacNeill, Waltham, Mass., assignor to said Arden B. MacNeill and Harris Harold Mac- Nei-ll, Waltham, Mass., as joint tenants Application December 30, 1944, Serial No. 570,709

2 Claims.

My present invention relates to apparatus for simultaneously drilling a plurality of blanks and particularly to such apparatus for drilling .a `rst bore of desired diameter and depth in one end of a blank to partially form an article andsimultaneously drilling a connecting `bore of different diameter in the other end of another blank in which such a first bore has been previously drilled.

In accordance with my invention,l I provide efcient apparatus for effecting such drilling operations accurately and economically. My apparatus comprises a base having a pair of spaced supports. One of the supports rotatably carries Work holders `for the blanks and the other .support slidably guides drill holders in axial alinement with the work holders.

An actuator, slidably mounted in each of the supports, is connected to the work holders and is under the control of means effective .to advance the drills towards the work holders through a stroke limited to eiect the drilling of bores of desired depth. I `provide manually operative means t position or hold the drill holders inoperatively against the influence of the advanc'- a ing means and I also employ a rotatable cam in control of the actuator to slide the actuator, at desired intervals, against the influence of the advancing means to provide clearing strokes for the drills.

In the accompanying drawings, I have shown i an illustrative embodiment of my invention from which these and other of its novel features and advantages Will be readily apparent.

In the drawings:

Fig. 1 shows apparatus in accordance with my invention in plan View.

Fig. 2 is a side view of the apparatus of Fig. 1.

Fig. 3 is a section on an enlarged scale, along the lines 3-3 of Fig. 1.

Fig. 4 shows, in a fragmentary plan view, the work holders and the drill holders operatively positioned with the blanks and the Work holders being sectioned, and

Figs. 5, 6, and l are enlarged sections showing, respectively, a blank, a blank drilled at one end to partially make the article, and a completed article.

Apparatus in accordance with my invention consists of a base I Il having a groove II to receive the ribs I2 of the supports I3 and I4 which are anchored in spaced relation by screws I5.

The support I3 has at one end a pair of spaced ears I6 rotatably supporting. one end of the shafts I1. At its other end, the support I3 has a wall I 8 terminating in a pair of spaced ears I9 through which the other end of the shafts I1 extend. Between the spaced ears I6 and I9 is a pulley 20 fast on each of the shafts Il adapted to be connected to any suitable drive,`not shown, as by a `common belt 2'I. The shafts I1 are `provided'witlfi work holders 22 and 23 each of which has a drill receiving passage 24. See Fig. 4.

The support I4 has a pair ofjspaced ends 25 and 2B slidably supporting drill holders 21 tosupport drills 28 and 29 in axial alinement with the work holders 22 and 23 respectively. In accord-- ance with my invention, I provide anlactuator 30 slidably supported by the wall I8 of the support I3 andthe ends 25 and 26 ofthesupport I4 and having a connection, generally indicated at 3 I with both of the drill holders 21. j

The connection 3| may conveniently comprise a block 32 locked to the actuator 3D by a set screw 33 and slidably receiving the rod 34 slidably supported in the ends and 2B of the supportl I4. I form the upper surface of the block 32 with a `slotted seat 35 which receives the envds35 of the `latches 31 clamped to the drill holders 21. Ithis constructiongleither `drillholder" 21 may be quickly and easily detached `from the actuator by raising the ends of the latches-31. "The latch on the holder for the'drill 28 is llocked to the block 32 asby a pin 31a to maintain its connection with the block 32 against the rotative inliuence of the work holders, bothof which rotate in the same direction. y

The other end of the vactuator 3l! has a bracket 31 to which is fastened one end ofa chain 38. The chain 38 is trained over a pulley 39 mounted in brackets 40 on the base I0 and to its other end is attached a weight 4I urging the drill holders 21 towards the rotating work holders 22 and23.

Movement of the drill holders 21 is limited by an adjustable stop indicated generally at 42 The stop 42 may conveniently comprise a bracket 43 clamped on the end of the actuator 3l). A screw 44, threaded through the bracket 43, engages the adjacent surface of the end 25 of the bracket I4 to limit the depth of the -bore established by the advancement of the drills 28 and 29 under the influence of the weight 4I.

In accordance with my invention, I journal a shaft 45 for a cam` 46 in supports 41 on the base I0. The shaft 45 has a pulley 48 adapted to be connected to any suitable driving means, not shown, as by a belt 49. The cam 46 has a camming portion 50 disposed to engage the adjacent end of the actuator 30When advanced by the weight 4| so that .the anus `2a and 29 have rod 34 is-dispcised toy engage with the upper end of the bracket 43 on the adjacent end of the actuator 38. The other end of the rod 34 is connected by a link 5l to a manually operable lever paratus well adapted to effect the accurate drilling of a plurality of blanks.

What I therefore claim and desire to secure by Letters Patent is:

1. Apparatus for simultaneously drilling a pair of blanks, said apparatus comprising a base, rst and second spaced supports on said base, a pair fof v'viorkflioldersjior saidl blanks rotatably supported Aby' saidlrst support, drill -holders slidably supported by said second support in axial v'alinement with said work holders, an actuator 52 pivotally mounted to the wall I8 intermediate Y theearslSasat 53. *i The operation of apparatus in accordance with my invention will be readily apparent. vIrl Fig. Y'7,

I have shown a' finished article at 54 that well illustrates the operation of my apparatus and its advantages. T-he article 54 has a bore 55 in one of its ends with which a bore 56 of smaller. diameter in the other end is connected.

Such an article is lformed from a blank 51 (Fig. 5)A which is positioned in the work holder 22 with the drills held in their inoperative position. `The lever 52 is released, and the weight 4IV advances the actuator 30 to advance thedrill 28 against the rotating blank 51.v As the drill Y28 advances into the blank, it is periodically reciprocated by engagement of the cam portion 50 with the actuator 30 to provide clearing strokes. The depth Qfithe bore is limi-ted by engagement of the stop 42 with thev end 25 which asserts the advancement of the actuator under the iniiuence of the weight 4|. f

The operator then'positions the-drills inoperatively and removes the partially made article 58, see Fig. 6. The article 58 is reversed and positioned in the work-,holder 23with its undrilled end exposed and a new blank 51 is-locked in the Work `holder 22.v The operator thenreleases the handle 52 to permitthedrills 28 and 29 to come against the rotating lblank 51 and the partly completed article 58, see Fig.4, so that at the Y end of the stroke, the operator will have a completed article and a partially completed article to replace it. v

Infpractice, the largerboreV is formed first and the smaller drill 29 .is disposed even with or set back slightly relative to the larger drill 28. By this, I minimize breakage since the smaller drill 29 never receives the fullf'd-rilling pressure. -From the `foregoing, it will be apparent that Ihave provided simple Yand leasily operated apslidably guided by both of said supports, a block having a transverse groove in its top surface fast ',onfsaid actuator, latches on said drill holders "seated infsaidgroove to detachably connect said Ydrill holders thereto, means in control of said actuator to advance said drill holders towards said work holders, means on said actuator to limit the movement of said actuator under the influence of said advancing means to limit the depth of the'bor'es, a member slidably' mounted on said second' support and said block,V and av manually operable `toggle pivotally connected to said member and said rst support'to engageI with said limiting means to carry said actuator 'against the influence of said advancing means.

2j Apparatus for simultaneously drilling a pair of blanks, said apparatus comprising a base, a pair of spaced supports on said base, a pair of work holders for said blanks rotatably supported by one of said supports, drill holders slidably supported by the other of said supports in axial alinement with said work holders, an4 actuator slidably guided by both of said supports, means connecting said actuator to said drill holders comprising a block fast on the actuator, the upper surface of the block vhaving a transverse groove anda latch clamped Vto each of the drill holders seated'in the transverse groove to beV disengaged therefrom byV partial rotation of the drill holders, and means to lock one of the latches to the block so that rotation of the work holders in the same direction is not operative to releasethe locked latch, means. in control of said-actuator to advance said drill holders towards said work holders, means to limit the movement of said actuator under the influence of said advancing means to limit the depth of the bores, .and operator controlled means to carry said actuator against the influence of said advancing means to position said drill holders remote from said workholders.

, ARDEN B. MACNEILL. 

